acreom does exactly what you described and more. You can have your notes there together with tasks that can be scheduled for any time interval or just a single point in time (it also supports repeating tasks) using either calendar or by just typing it out in note using natural language (e.g. do yoga every other day at 7am). You can then group them by note they are in, labels or date. It also has daily note and a review feature where it shows all the overdue tasks plus the tasks for today on top of the daily note.